. Occasional papers of the California Academy of Sciences. anal brace. The hindwing is similar to the forewing but al-ways is shorter, broader and certain veins, such asMP and Cu, may be less strongly represented. Insome species of Archembia Ross, the anal area isslightly more expanded than in the forewing (Fig. 27), Cross-veins may be highly variable in positionand number within a species and may even differ inthe left and right wings of a single individual. How-ever, their general positions and number is rather con-stant within a species, or even a genus. In Oligotoma,for example, cross-vein
. Occasional papers of the California Academy of Sciences. anal brace. The hindwing is similar to the forewing but al-ways is shorter, broader and certain veins, such asMP and Cu, may be less strongly represented. Insome species of Archembia Ross, the anal area isslightly more expanded than in the forewing (Fig. 27), Cross-veins may be highly variable in positionand number within a species and may even differ inthe left and right wings of a single individual. How-ever, their general positions and number is rather con-stant within a species, or even a genus. In Oligotoma,for example, cross-veins seldom if ever are presentbehind RP. There seems to be no regularity of cross-\ein position which would justify nomenclature forcells they delimit. The upper and lower wing surfaces are denselyclothed with small, short hairs commonly calledmicrotrichiae which, having no apparent basal sock-ets, appear to arise as direct outgrowths of the wingmembrane. The entire outer margins of the wing and ROSS: EMBIA, BIOSYSTEMATICS OF THE ORDER EMBIIDINA, PART 1 29. HINDWING
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectscience, bookyear1890
